Abstract In this study, an experimental investigation was conducted to assess the flexural tensile strength and crack-closing performance of mortar beams containing short shape memory alloy (SMA) fibers, randomly distributed only on the tensile side. The SMA fibers were mainly composed of titanium (Ti), nickel (Ni), and niobium (Nb). In addition, the effect of tensile steel wires on the flexural strength and crack-closing performance was evaluated. A four-point bending test was performed to evaluate the post-cracking tensile strength. This study also suggested a proper model to calculate the ultimate flexural moment of the SMA fiber–embedded beams. Subsequently, a heating plate that could be installed at the bottom of the beam was used to induce the shape memory effect and measure the closed crack width. This study assessed the crack-closing performance induced by the SMA fibers at the bottom side of the beams and the resistance of the tensile wires in the beams.

中文翻译：

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SMA纤维随机嵌入砂浆梁受拉侧的裂缝闭合和弯曲抗拉能力

摘要 在本研究中，进行了一项试验研究，以评估仅在受拉侧随机分布的含有短形状记忆合金 (SMA) 纤维的砂浆梁的弯曲抗拉强度和裂缝闭合性能。SMA纤维主要由钛（Ti）、镍（Ni）和铌（Nb）组成。此外，还评估了拉伸钢丝对弯曲强度和裂纹闭合性能的影响。进行四点弯曲试验以评估开裂后的抗拉强度。这项研究还提出了一个合适的模型来计算 SMA 光纤嵌入梁的极限弯矩。随后，可以安装在梁底部的加热板用于诱导形状记忆效应并测量闭合裂纹宽度。